Rendering with depth buffer disabled and stencil buffer enabled
leads to memory leak if we set viewport a large size on Intel
windows platforms. So we enable depth buffer if stencil buffer
is enabled to workaround this issue.

TEST=gl_test.exe --gtest_filter=GLClearFramebufferTestWithParam/GLClearFramebufferTest.ClearDepthStencil/0
TEST=conformance/rendering/rendering-stencil-large-viewport.html
TEST=RenderStencilBufferTest.DrawWithLargeViewport/ES3_D3D11

BUG=782317

Change-Id: Idb185db296f13e3fa897534514e198651a56439f
Reviewed-on: https://chromium-review.googlesource.com/809574
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>